2007-03-07 05:50:41 · 5 answers · asked by angeleyes26 1 in Health ➔ Other - Health
The humerus, or arm bone, is the longest and larges bone of the upper extremity. It articulates proximally with the scapula in a ball joint, and distally at the elbow with both the ulna and radius in a hinge joint.
The proximal (top) end of the humerus consists of a head that articulates with the glenoid cavity of the scapula. It also has an anatomical head, which is an oblique grove just distal (below) to the neck. The lesser tubricle is an anterior projection. Between these tubrecles runs an inter-tubercalur sulcus (bicipital groove). The surgical neck is a constricted portion just distal to the tubricles. It is so named because of its liability to fracture.
The body (shaft) of the humerus is cylindrical at its proximal end. It gradually becomes triangular and is flatted and broad at its distal end. Along the middle portion of the shaft, there is a roughened, V-shaped area called the deltoid tuberosity. This area serves as a point of attachment for the deltoid muscle.
The following parts are found at the distal end of the humerus: The capitulum is a rounded knob at that articulates with the head of the radius. The radial fossa is a depression that receives the head of the radius when the forearm is fixed. The trochlea is a pulley-like surface that articulates with the ulna. The coronoid fossa is an aterior depression that receives part of the ulna when the forearm is fixed. The olecranon fossa is a posterior depression that receives the olecranon of the ulna when the forearm is extended. The medial epicondyle and lateral epicondyle are rough projections on either side of the distal ened.
2007-03-07 06:12:42 · answer #1 · answered by wendy_the_pyro 4 · 1⤊ 0⤋
The head of the humerus articulates (forms a joint) with the glenoid cavity of the scapula and has a constriction called the surgical neck that's often the seat of a fracture. The condyle at the distal end (farthest from the trunk of the body) has several depressions into which articulate the radius and the ulna. Proximally (closet to the trunk) the body of this bone is nearly cylindrical. Distally, it's flattened and more like a prism. It has two borders and three surfaces. "Funny bone" is a name given to a point at the distal end of the humerus where the ulnar nerve crosses the elbow joint near the surface. It produces a tingling sensation when subjected to external pressure.
2007-03-07 06:09:25 · answer #2 · answered by TweetyBird 7 · 0⤊ 0⤋
special features humerus bone
2016-02-01 02:53:44 · answer #3 · answered by Stacee 4 · 0⤊ 0⤋
The trochlea, the epitrochlea, the V for the insertion of the Deltoid....you should rather see in an Anatomy book.
2007-03-07 05:56:27 · answer #4 · answered by mbestevez 7 · 0⤊ 0⤋
Nothin' Like a Humorous bone I always say...
2007-03-07 06:06:55 · answer #5 · answered by .G. 7 · 0⤊ 1⤋
it makes you giggle.
2007-03-07 05:54:01 · answer #6 · answered by Anonymous · 1⤊ 1⤋